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Hello, everyone I've been reading this forum for a few weeks now. Kinda wish I found it before I got the bike but oh well. So, I've got a 1982 Yamaha xs400 it's gonna be my first bike. I say gonna because 1 I haven't taken the course yet and 2. It needs a little work to be street legal and road ready. I got the bike first because it was a really sweet deal old guy who works on motorcycles/atvs/ gocarts drives it to town and his mailbox (he's in the country) but wife says it's gotta go so he sold it to me cheap (to stop her nagging lol). Ok enough back ground on to the bike it's got a slight leak on what i believe is the rubber air cleaner joint (thats what the web says it is) not bad but not good. But then after a series of unfortunate events it started leaking oil heavily from the kickstand and chain traced it back to what I believe is the Air Cleaner assembly (agian the web says that) noticed a hole in the box. My first question is a "dumb" one, why is there "oil" in an "air" cleaner? And 2, the hole in the assymbly seems like it was desgned that way is there a plug missing? Bonus: Is the major oil leak cause for the major power loss and white smoke when reved up? Thank you all in advance for your help.